Depression refers to the profound style of poetry and the pause of language situation. Most of the ancients were strict in tempering poetry, especially Du Fu's choice of words and sentences. In "Into the Carving Fu Biao", he used "depression and frustration" to evaluate his poetic style, and every word was painstakingly transformed by him.
The so-called "Shen" can be seen in the rough and simple language. Although I don't make public, my thoughts and feelings are so low that it is best to raise them first and then suppress them. For "Depression", it can be seen that the poem is sincere and implicit, and the strong feelings are intense to the extreme without being sent; And "pause" refers to the literal pause of a sentence.
However, in Du Fu's poems, "Dun" not only tends to ease the poetic expression, but also plays a connecting role in structure, implying the meaning of a fine hair building an intermittent bridge; ; As for the word "frustrated", although it means frustration, there is another world in Du Fu's poems.
Any "frustrated" person will have ups and downs on the language potential, with twists and turns and rhythmic changes in tone. To sum up, "depressed and frustrated" refers to the earth-thick emotion.